Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van pho hoc snippets" » "van phu hoc snippets", "van cho hoc snippets", "dan pho hoc snippets", "van phoi hoc snippets", "van pho ho snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("van pho hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van pho hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van pho hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van pho hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.